Metallic packing.



Patented May 27, l902.

N A M A T S F l om 8 0 U 7 nw N METALLIC PACKING.

(Application flied Nov. 13, 1900.)

(No Model.)

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DAVID F. STAYMAN, OF BALTIMORE, MARYLAND.

METALLIC PACKING.

SPECIFICATION formingpart of Letters Patent N 0. 700,988, dated May 27, 1902.

Application filed November 13, 1900. Serial No. 361388. (No model.)

To all whom, it may concern.-

Be it known that 1, DAVID F. STAYMAN, a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented a new and useful Metallic Packing, of which the following is a specification.

My invention is an improved metallic packing for piston-rods and the like; and it consists in the peculiar construction and combination of devices hereinafter fully set forth, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a sectional view of a stuffing-box for a pistonrod provided with my improved metallic packing. Fig. 2 is a detail View of my improved metallic packing, partly in section, one of the packing-segments being removed, so as to disclose the snbjacent packing-segments.

In the embodiment of my invention I provide an annular casing 1,-which is adapted to fit within a stuffing-box a of the usual form. The piston rod or shaft b passes through the central openingin the said casing. The outer side of the latter is open, and in the said casing are disposed two packing-rings 2 3, each of which comprises a series of segments. The segments of the packing-ring 2 are designated by the referencenumeral 2, and the segments of the packing-ring 3 are designated by the reference-numeral 3. The ends of the respective segments of the packing-rings and the joints or spaces between the ends of said segments are radial from the center of the piston rod or shaft on which said segments bear. I have here shown each of the packing rings as composed of three segments. This number maybe increased; but each pack ing-ring must be composed of no less than three segments in order that each segment may be free to move radially independently of the others, as hereinafter stated. The proximate ends of the respective packingrings do not meet, spaces, as at 4, being formed between the proximate ends of the said segments. The latter on their inner sides fit snugly around the piston rod or shaft. The

the said casing 1.

with bosses or offsets 6, which fit in the notches 7 of the segments. The ends of the said springs bear against the flange 5 of the annular casing 1, the said springs pressing the inner sides of said segments closely against the piston rod or shaft. In the event that the piston rod or shaft is not perfectly true and is not exactly concentric with the stuffing-box the packing-segments by means of the springs 6 are adapted to move eccentrically with the piston rod or shaft and to remain under all conditions in engagement therewith, so as to effectually pack the same, as will be understood.

The segments of one packing-ring are disposed with their centers over the joints of the segments of the other packing-ring, as indicated in Fig. 2. In order to preserve this relative arrangement of the respective segments of the packing-rings, I provide one of the segments of one packingring with a dowel-pin 8, which operates in an opening 9 of the opposing segment of the other packingring, thereby preventing independent circumferential movement of the packing-rings, and hence preventing the joints of the segments of the respective packing-rings from getting in line with each other. The opening is larger than the dowel-pin to provide the lost motion necessary to admit of the radial movement of the segments.

The boss of the spring 6 of each segment of a packing-ring bears upon the adjacent segment of the adjacent packing-ring, and thereby the said springs are at all times retained in correct position in line with the segments to which they are attached and are prevented from becoming disengaged from the segments when in use. It will be understood, however, that the springs may be readily removed from the segments when desired. By thus providing the segments with the notches on their outer sides and the flat springs with the bosses or offsets to fit in said notches the assembling and disassembling of the parts is greatly facilitated, as will be understood.

An annular plate 10 is placed on the open side of the annular casing and bears on the upper or outer packing-ring, my metallic packing comprising the annular casing, the packing-rings movable eccentrically therein, and the annular plate to close the open side of the annular casing. In practice one or more of my improved metallic packings may be used in a stuffing-box. In Fig. 1 of the drawings Ishow two of the same in the stufiing-box, in which arrangement I omit the plate 10 of the inner packing, and the gland c bears against the plate 10, which covers the outer packing. It will be understood that I may provide my improved packing with two or more of the spring-supported eccentricallymovable packing-rings and that each packing-ring may be composed of three or more of the segments.

The opening 9 is of such size that the dowelpin 8 can play therein in any. direction. Hence the respective packing-rings are adapted to move eccentrically independently of each other to accommodate themselves to any eccentricity or variation from a straight line in the piston rod or shaft and to effectually pack the same under all conditions.

I do not desire to limit myself to the precise construction and combination of devices hereinbefore described, as it is evident that modifications may be made therein without departing from the spirit of my invention. Neither do I limit myself to the use of the form of spring hereinbefore described for pressingthe segments against the piston-rod, as coiled or other springs may be employed for that purpose.

Having thus described my invention, I

claim- ,1. The combination with a stuffing box and a piston rod or shaft, of a plurality of contacting packing-rings, movable eccentrically therein, independently of each other, each packing-ring comprising a series of radiallymovable separable segments having radial meeting ends, springs to press said segments inwardly, on radial lines and maintain said segments in contact with said piston rod or shaft, whereby said packing-rings are adapted to move eccentrically in said stuffing-box to conform to any eccentricity or crookedness in the piston rod or shaft on which the packing-rings bear, and whereby each segment of each packing-ring is movable radially, independently of its fellows, to compensate for variations in the surface of the piston rod or shaft, the joints between the segments of said respective packing-rings being out of line with each other, substantially as described.

2. The combination with a stuffing -boX and a piston rod or shaft, of a plurality of (3011-. tacting packing-rings, movable eccentrically therein, independently of each other, each packing-ring comprising a series of radiallymovable separable segments having radial ends, springs to press said segments inwardly, on radial lines and maintain said segments in contact with said piston rod or shaft, whereby said packing-rings are adapted to move eccentrically in said stuffing-box, to conform to any eccentricity or crookedness in the piston rod or shaft on which the packing-rings bear, and whereby each segment of each packingring is movable radially independently of its fellows, to compensate for variations in the surface of the piston rod or shaft, the joints between the segments of said respective packing-rings being out of line with each other, one segment of one packing-ring having a dowel-pin projecting from one side thereof, and one segment of the other packing-ring having an opening to receive said dowel-pin, said opening admitting of lost motion of said dowel-pin therein, substantially as described.

3. The combination with a stuffing-box, of a plurality of contacting packing-rings'movable eccentrically therein, independently of each other, each packing-ring comprising a series of segments having radial ends, and flat springs bearing inward on said segments said springs having offsets and said segments having notches in their outer edges engaged by said offsets, whereby the said packing-rings conform to any eccentricity or deviation from a straight line in the piston rod or shaft on which the packing-rings bear, and each segment of each packing-ring being movable radially, independently of its fellows, to compensate for variations in the surface of the piston rod or shaft, one segment of one packing-ring having a dowel-pin, and the opposing segment of the adjacent packing-ring having an opening engaged by said dowel-pin, said pin having lost motion in said opening, substantially as described.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

. DAVID F. STAYMAN.

Witnesses:

E. E. DOYLE, HARVEY T. WIN-FIELD. 

